The risorius and the buccinator muscles assist in the retraction of the lips, as well as support entrapment of air within the oral cavity.
笑肌和颊肌帮助唇
收缩，也支撑了整个口腔
流通。
The risorius and the buccinator muscles assist in the retraction of the lips, as well as support entrapment of air within the oral cavity.
笑肌和颊肌帮助唇收缩，也支撑了整个口腔流通。
声明：以上例句、词性
类均由互联网资源自动
，
未经过人工审核，其表达内容亦不代表本软件
观点；若发现问题，欢迎向我们指正。